from amelia air hard to db cooper's millions. the lipd berg baby is an enduring mystery and that intrigued a mystery. why have we been engaged so long? >> it's the case that never dies. that's probably true in this past year. there two new books about the case. it's hard to realize because it was ache years ago, but this is probably the most significant crimes ever to happen in america. it's after this terrible event that the congress creates a federal police force, the fbi in recognition that there just certain crimes that state and local forces cannot solve. lindbergh was the most famous man in the world. when his son is kidnapped and killed, the out pouring of grief had not been felt since the lincoln a ssz nation. >> what have you learned? >> there have been a lot of books britney about the person in the case and whether he was in fact independent when the police arrest him. he projects himself as an innocent man who would never do such a thing. he goes to the chair proclaiming his innocence even though the prosecution offere